feat(file-safety): file version token for the guarded-write path (A1, #1375) - #1383
feat(file-safety): file version token for the guarded-write path (A1, #1375)#1383easonLiangWorldedtech wants to merge 3 commits into
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…oo-Code-Org#1375) Introduces the version token - dev:ino:size:mtimeNs:ctimeNs derived from a single fs.stat - a pure function of a file's on-disk state that every process computing from the same state agrees on. The compare-and-swap write guard (A2/A3) will compare the token observed at read time against the token recomputed before a write to detect stale or replaced files. No production callers yet: this is infrastructure for the file-write safety series (plan: #33), part of upstream epic Zoo-Code-Org#1375.
…oo-Code-Org#1375) Review finding: 'ino is an exact integer' was overstated. Node exposes ino as a float64 number: exact for small POSIX inode numbers, but on modern Windows the file ID exceeds 2^53 so Node's own value is already rounded (verified on node v25: non-zero ino, isSafeInteger=false). It remains deterministic per file (same file -> same token), so the token contract is unchanged; change detection rests on exact dev/size plus the mtime/ctime ns fields. Document the bound instead of claiming exactness.
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe PR updates version tokens to use exact bigint filesystem metadata. Tests cover token formatting, nanosecond precision, large sizes, file changes, and ChangesVersion token generation
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This change adds isolated file-version token utilities without changing production behavior, and no actionable merge-blocking risk remains beyond normal checks and review. Suggested reviewers: 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Inline comments:
In `@src/utils/versionToken.ts`:
- Around line 24-30: Update computeVersionToken and versionTokenOfStat to
preserve dev and size precision by obtaining stats with fs/promises.stat using
bigint mode and formatting the resulting BigIntStats values consistently;
alternatively, narrow the documented token guarantee and add a regression test
covering values above Number.MAX_SAFE_INTEGER.
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src/utils/__tests__/versionToken.spec.tssrc/utils/versionToken.ts
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Zoo-Code-Org#1375) CodeRabbit finding on this PR: the default numeric fs.stat() loses precision (values above 2^53 are rounded, including Windows file IDs) and the ms->ns derivation introduced a double-precision quantum. Fixed by fetching the stat with { bigint: true }: all five token fields (dev, ino, size, mtimeNs, ctimeNs) are exact BigInt values rendered as decimal strings, with no float anywhere. The sub-ms test now asserts an exact 1_000 ns delta instead of bounded drift, and a regression test pins a size of 10^16+1 (> Number.MAX_SAFE_INTEGER).
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Summary
S1 of the file-write safety series (plan: easonLiangWorldedtech/Zoo-Code#33), part of epic #1375.
Introduces the version token —
dev:ino:size:mtimeNs:ctimeNsderived from a singlefs.statin bigint mode — a pure function of a file's on-disk state. Every process that observes the same file state (a second VS Code window, the CLI, the user's own editor) computes the same token. The compare-and-swap write guard (A2/A3) will compare the token observed at read time with the token recomputed before a write to detect "the file changed since the read" (stale) or "the file was replaced by a different file" (dev/ino change).Changes
src/utils/versionToken.ts(new):versionTokenOfStat(stats: BigIntStats): string— pure, zero I/O; exported separately so the exact format is pinned by synthetic-stat tests.computeVersionToken(filePath: string): Promise<string>— onefs.stat; rejects with the underlying ENOENT for absent files (how an unobservable target is treated is decided by the guard layer, A3).src/utils/__tests__/versionToken.spec.ts(new): determinism, exact format pin, distinctness on size/mtime/dev+ino change, exact 1_000 ns delta, size beyond 2^53 (regression), real-file round trip, ENOENT rejection.Notes
{ bigint: true }(BigIntStats), so all five fields —dev,ino,size,mtimeNs,ctimeNs— are exactBigIntvalues rendered as decimal strings, with no float involved anywhere. No precision loss for sizes or inodes beyond 2^53 (Windows file IDs included), and the ns timestamps are the kernel's exact nanosecond values (no ms→ns quantization). Guarantee: same disk state → same token (deterministic across processes); any change to size, file identity, or mtime/ctime → a different token. A regression test pins a size of 10^16+1 (> Number.MAX_SAFE_INTEGER), and the sub-ms test asserts an exact 1_000 ns delta.Tests
- ESLint clean on both files; suppression counts unchanged.
This is an auto-generated comment: release notes by coderabbit.ai -->pnpm --dir src exec vitest run utils/__tests__/versionToken.spec.ts→ 10/10 passingSummary by CodeRabbit
- New Features
- Improved file change detection with exact device, inode, size, and timestamp information.
- Preserved nanosecond timestamp precision and accurate handling of very large files.
- Added asynchronous file version token computation.
- Bug Fixes
- Prevented precision loss that could cause changes to go undetected.
- Tests
- Added coverage for deterministic tokens, file updates, high-resolution timestamps, large files, and missing-file errors.
end of auto-generated comment: release notes by coderabbit.ai -->